"Bear in mind that the people who control these weapons generally think of them as big sticks of dynamite for killing bad guys/bringing about the Rapture."

Huh? If there's anything in the world that makes you snap out of idiocy and think rationally, it's a fucking nuclear weapon. It even made Reagan rethink things. The biggest dangers with nukes are by far mistakes and unintentional launches. The whole point of nukes is not to use them. Now that we know about nuclear winter, the chances of a nation actually launching one or several are practically nil.